Perpetual calendar.



F. x. M OERK. PERPETUAL CALENDAR 8 1 u. mm w w; Mn J n 5 m m P Q um P A D N 0 H A m H P A 1 6 O 6 6 9 9 1 SUB'E Difeci-ions: I 7

Move Slide un'Hl one 0+ 'IhgSahb! Black Blacks is in irhe MI}; 7712 gears fnihe same bile have the same Celery-in! mmYean-s(biack-f1gu.r

Zearwmz+ed;qfl .encgphizg f-m- Janna-r9 and Fe r F'or l am 5) nw Slide 2% 113a ri h fair Leap Years (black fl'gur'es) Mlle 1 I FOR HOLIDAYS SEE WMW ATTGR/VEV.

F. x. MOERK.

PERPETUAL (LALEFJDAR. APucAnou FILED APR. x3, 15m. 1 Q9 Patented May 21, 1918.

2 SHEETSSHEET 2.

FRANK x. noun, or PHILADELPHIA, rnnnsrnvamarnnrnrnu. cannmmza.

Specification of Letters Patent.

Patented May 2;, 1918.

Application filed April 13, 1917. seri rno. 161,695.

endars, of which the following is a full,

clear, and exact description, referencebeing had to the accompanyin drawings, which form a partof this speci cation.

My invention relates to calendars and I especially to that form known-as a perpetual calendar, namely: one which not only forms a calendar of the usual form for the current year,but also is readily adaptable for an indefinitenumber of years both in the past and inthe future.

The object of my 1nvent1on1s'to provide such a calendar, which shall present calendars of the twelve months of the-year, visible at one time on its face, and which shall be capable of change, with a minimum of mental and physical effort, so that said monthly calendar may read correctly for any common. year or leap year, pastor future. Another object of the invention is to simplify the construction of the calendarand more.v particularly to effect the results sought by theu'se-of but one face of each of two relatively movable cards.

A preferred embodiment of my invention is shown in the accompanying drawings, in which Figure 1 is a front or face view of my improved calendar shown as set for the present year.

Fig. 2 represents the face of the interior sliding member.

Fig, 3 represents the exterior shde or leap year flap.

' The mechanical construction of my calendar is very simple aaid, as shown, consists of the stationary enveloping member an, in which is movable the slide a and on the front of which is movable the slide or flap b. The envelopin member is formed of similar front and back sheets fastened together along both sides and the bottom as at 0. Within this envelop is' slidably mounted the member a to move up and down vertically. f

An unusual feature of the front face of the calendar will be immediately noticed, in that there are fourteen monthly openings therethrough for the twelve months of the or leap year.

year. This is brought about'by the putvision of separate openings for January and February of leap years as well as "January and February of common years, all the rest of the months remaining the same for both. Down the edges of these openings, on the strips of the front. sheet of member a: re-

maining therebetween, are arranged the days of the week in regularbrder from Sunday to Saturday. Each of the openings is headed by thename of a month, in order from January to December, January and February being duplicated as stated above. Through all of these openings appear certain portions of slide a, containingnumbei's in calendar form, and said openings are of such size and shape as to always permit the correctnumber of days for each month to be seen-'on slide a, in any of its positions.

The leap year flap .b is pivotal-1y connected to the enveloping member 1:, as by the eye d. On this as a center, ember b may be turned from one side to the other, covering two of -the above mentioned fourteen openings in member an, and leaving to view an entire twelve month, either common.

over the January and February openings f.

on the left side, when the observer would As indicated by dotted lines. in Fig. 1, member I) is turned to the right read upon member I) Set for leap years and calendars for January and February containingtwenty-nine days, are visible to the right, calendars for the remaining ten months appearing beneath, in two rows of five months each. This arrangement brings August directly beneath March, and it is to be noted that both these months contain the same number of days: thirty-one. Likewise, September comes beneath April, and they .have the same number of days: thirty. It

willbe seen that the rest of the months in these two rows fulfil the same relation to I each other, and this fact I have utilized to add to the completeness and simpleness of for March and for August as the slide a is set for ciifierent yeers- 'Iihis could not be To set the caieneler to were the months of not the length.

The lower portion of the front face of member w comprises at teole Ia, elf years, ericl may be as extensive esdesireti or practical, represent ng the scope of the calender in years pest and future. in the form depicte cl in Fig.1 provision has beenmede to cover 250 years, and the leap years are oustinguislie' i by appearing in White figures 011 e black gro'oncl.

intermediate in this year table is a cutaway colinnn forming an opening; 2", through which is visible 2. clistingoisli' mark or marks T14793- correct read ing -for any year proviciecl" for, it is oniy necessary to 'menipulete silicle a from. top .until comes opposite the" norizontel line-in the year table 72 the r desirecl, flap 2 being turnetl es before clesoribecl to suit either common orleep year? The arrangement of the mouth openings e, g in member mi, and their relative spec-- 7 number of rieys in e Week I To allow this simpie and systematic (necessitates certain irregoiaritzes in ace ou mg is "such that the clay figures upon the face ofslicie (a form continuous columns 0%. Moreover, tee figures 1H" column are simply progressive, running 1, 2, 3., i,

to 28, 29,' or 31 es the case may be.- Anti the figures next to each other 1n the rows forineclfl the atijoining columns differ from "each other every case by Y, the

.more that the I vertical distance of seven horizontal lines of figures. Qoiumns m on slide a are extenfled beyoncl what will Show at any time through openings 6 f y by the distance therefrom ofsix horizontal lines. To provide a stop for the i'novement of slide a, in both an upward and clovvnyvarl (iirection, thepivot eye d or flap 6 1s extended;

through from the front to the back of the celenrlar; and slot Z0 provided 'in'sli ie a therefor, of just sufiicient length to allow slide ato be moverl the seven vertical lines necessary. v

Pivot eye d thus connects the front and back sheets of the envelop member 0a, and

adds thereby to the stiffness and durability of the calendar structure. 9 V

It Will be noticed, that there 1s a number 31', stenoling sepe'raterl from the others. on

the right hand sinie of column m on slide This number comes in the month of July only and is offset as shown to prevent its appearing in the opening 6 for Februcry in the upper positions of sliole a. A i

v the face of member an.

' tions enclferre;

auxiliary opening provideti f0Z' i,l1IiS number contiguous to the July opening in.

iievingnow fully describes vmy inven tion, whee I desire to claim. end. protect by Letters Patent is:-

.'1. A celencr'comprising'e centleaving two pairs of 1oerforetirms one pair corregpendin e em anon of January end; repruery otcoinmon yeers and theother new corresponai ngg to the months of Jenm.

eryf emil ebroery of leap 'yeers, and ten perforations corresponing co-the rem-flaw ing months of {my yee1,'en l e slideble sheet provicled with numerals indicetive of ole-ye lining with seicl perform of months 31216 is movei into riiii'erent positionsflo ex'nilrit geo, when the slidielole sheet 3 in the several perforations, *iifierent eonibinations oi wnomerels correspon ziingg totlie eelenriers o different common enol leap yeers.

Aceleoder com irisin \tli'e'elements set forth in claim L we comprising also, on-

the firstnemefl We, rows of spaces corres cholin to liiierent series of ears en&

year numerals errenge" on said spaces, enol an indicating device on the movable oer l eriepteol to be registerecl with any row of spaces, whereby the calender for any year in such row of spaces will be indicated in the "en. perforations eiaove named and in one s e esp year or e common year,

3.- A calender comprising the elements set forth in claim 1 and comprising also movable means elapteci'to conceal either'of the said we pairs of perforations and the mini hers registering therewith, thereby embifirg:

the calendar to be adjusted to inclicate eel tem of one or the other kind of years.

e r of the two pairs of perforeeions ole-I iclent upon WliS'tllQK the lest'nemecl year 1 l 4. A calendar comprising the elements set forth in claims 1, Bend 3.

5. A. calender comprising a card havln'g ten perforations arranged to form fiverows of two each and corresponding to ten months of the year and four perforations Mining-respectively with four of said rows,

two of said four perforations corresponding to the months of January and February of common year's end the other two of said four perforations corresponding to the months of January and February of leap years and a slid-able card having -fi'\"3 series of numerals'alining with saidl five rows of spaces and adapted to be moved into clifierent positions to exhibit in the several perforetions, (liti'erent combinations of numerals corresponding to the calendars or" different common and leap years.

6. Amelengler comprising a card having at'least seven'rows of spaces provided with year numerals" and perforations exceetiing we j in number the months of a year, and a, no

, twelve of said perforations, numerals af-' fording a calendar corresponding to the common years of the last named row of year numerals, and in another combination of fording ,a calendar corresponding to the leap years of the last named row of year numerals.

7. A calendar comprising a card having ten perforations corresponding to the last ten months of a year and arranged in five rows, the perforations of the first, third and fifth rows corresponding to the six of said months having thirty-one days and the perforations of the second and fourth rows corresponding. to the four of said months having only thirty days, two perforations, corruspomlillg to the months of January and February of one kind of years, alining respectively with the first and second rows, and two perforations, corresponding to the .months of January and February of the other kind of years, alining 2 respectively with the fourth and fifth rows, and a movable card having five, rows of numerals, indicative of days of the month, alining with the five rows ofperforations, the last named numerals. being arranged to exhibit, in the different perforations, different combinations of numerals, each of which combinations corresponds to the calendars of a given series of leap years and common years.

8; A calendar comprising a card having perforations corresponding to months, and

a sheet provided with numerals indicative of days of months and arranged to slide relatively to said card, the distance between adjacent perforations measured in the direction'of said sliding movement being sub stantially less than the Width of any of said spaces measured in the same direction, the day numerals being so arranged that certain of such numerals-register with a plurality of such adjacent perforations in different positions of said sheet.

In testimony of which invention, 1- have hereunto set my hand, at Philadelphia, on this 12th day of April, 1917. i. F ANK XtMOERK. 

